[TriLUG] throttling bandwidth in a test environment

[David Rasch]

Unfortunately, this isn't going to simulate a T1 very well as a
null-modem cable can only do 115200bps while a T1 can do approximately
1.5Mbps. 

Other than the pf firewall mentioned by Aaron, I've done this previously
with a VPN connection.  For example, openvpn has a "--shaper" parameter
which allows you to limit the speed of a connection to an arbitrary
number of bytes/sec.

David

On Wed, Aug 11, 2004 at 01:17:21PM -0400, Greg Brown <gregbrown at mindspring.com> wrote:
> I did this once at Oculan.. sort of.  I had two ethernet segments with 
> a "wan" in the middle... here's how I did it.
> 
> Machine 1:  ethernet port 192.168.13.1 network 192.168.13.0/24
>                       serial port 192.168.14.1
> Machine 2:  serial port 192.168.14.2
>                       ethernet port 192.168.16.1 network 192.168.16.0/24
> 
> I connected the serial ports via a null modem cable and, if memory 
> serves, I used ppp to connected them together.  Or was it slip?  No, it 
> was slip.  I think this is the how-to webpage I used:
> 
> http://www.dbaoncall.net/references/ht_connect_2pc.html
> 
> That's about all I can recall, other than it worked.  Hotgrits on the 
> IRC channel might be able to help out with this, as I recall he was a 
> wealth of knowledge regarding serial communication and linux.
> 
> Greg
> 
> On Wednesday, Aug 11, 2004, at 12:50 US/Eastern, Dan Monjar wrote:
> 
> >
> >Anyone know of any techniques to throttle bandwidth on a LAN for 
> >testing? We want to see how an application would run across a WAN of 
> >varying bandwidth.  How would I make a Ethernet segment throttle down 
> >to something like T1 speeds?
> >
> >-- 
> >Dan Monjar
> >-- 
> >TriLUG mailing list        : 
> >http://www.trilug.org/mailman/listinfo/trilug
> >TriLUG Organizational FAQ  : http://trilug.org/faq/
> >TriLUG Member Services FAQ : http://members.trilug.org/services_faq/
> >TriLUG PGP Keyring         : http://trilug.org/~chrish/trilug.asc
> >
> 
> -- 
> TriLUG mailing list        : http://www.trilug.org/mailman/listinfo/trilug
> TriLUG Organizational FAQ  : http://trilug.org/faq/
> TriLUG Member Services FAQ : http://members.trilug.org/services_faq/
> TriLUG PGP Keyring         : http://trilug.org/~chrish/trilug.asc
> 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 189 bytes
Desc: Digital signature
URL: <http://www.trilug.org/pipermail/trilug/attachments/20040811/4ac04b25/attachment.pgp>